It's only me.

1

1) It is still raining.

2) It's only me.

I have learned that"it" is a dummy pronoun or impersonal pronoun when it is used for the sentnece of the #1 but I have heard that even when it is used for the #2 like it is me and it is you, etc, it is called a dummy pronoun, so do you agree with this or only when it is used like it is raining, it is Wednesday ,etc, it can be called a dummy or impersonal pronoun or can we consider it as a dummy pronoun in the both sentences?

And the two terms dummy pronoun and impersonal pronoun refer to the same meaning, right?